yunt2chat......Be sure to check the carb settings. If your running on the rich side.....that is where you want to be.....especially for the engine break in. If your already past the engine break in and your still running extremely rich.....then you will want to lean it a little at a time.....1/8 turn on the high speed needle....then try some high speed runs. BE SURE YOUR ENGINE IS FULLY WARMED UP.....before you try and change the needle settings. Look in your manual for the directions on making the carb adjustments.

As was mentioned.....also check your glow plug and make sure it's not going bad. Take it out and place the glow igniter on it and look at it to be sure the element is glowing......if it's questionable....then put a new glow plug in.

Good Luck!